A Numerical Model for Seismic Analysis of Piles in Liquefying Soil

Liyanapathirana, D. S.; Poulos, Harry G.

doi:10.1061/40601(256)20

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Dealing with simplified geometries, numerous studies solved the soil-pile-structure interaction through systems that adopt the Winkler method and numerical techniques [2][3][4][5][6][7][8]. However, the use of numerical models becomes a unique alternative solution when the systems are non-linear or have a 3D geometry.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Soil–Structure Interaction Effects in Buildings Founded on Vertical Reinforcement Elements

Jiménez

Dias

2022

CivilEng

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Pile foundation is an effective technique to support buildings in the presence of soft soil and seismic areas. More recently, the rigid inclusions system has also been utilized for founding buildings. Both systems increase the bearing capacity of the soil and allow reducing the total and differential settlements in the structure. However, the study of these systems in a complete and accurate way implies the consideration of the soil–structure interaction (SSI). In order to investigate the impact of different pile toe conditions (including the placement on hard soil, an anchorage and floating piles) in the response of mid-rise buildings, numerical models with a 5-storey frame building founded on the inclusions system (soil–inclusion–platform–structure) are analyzed and compared with the pile system (soil–pile–structure). Fully coupled finite difference numerical models were developed using Flac 3D. The influence of the dynamic characteristics of the structure was considered analyzing buildings with different heights (3 storeys to 7 storeys). The linear elastic perfectly plastic model with a Mohr–Coulomb failure criterion is used to represent the behavior of the soil. Values of the maximum lateral displacements, of the inter-storey drifts and of the shear forces distribution in the buildings, as well as the rocking of the foundation, are presented. Concerning the foundations, efforts and displacements are compared for the different systems. The results show that the type of support condition influences the seismic response of the building and the efforts and displacements in the rigid elements, depending on the foundation system. The efforts at the toe level in the rigid elements are highly influenced by the support conditions, but there is only a slight influence from the head connection.

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Section: Introductionmentioning

confidence: 99%

Dynamic Soil–Structure Interaction Effects in Buildings Founded on Vertical Reinforcement Elements

Jiménez

Dias

2022

CivilEng

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“…They showed that the pile response is strongly affected by type of soil, nature of input motions, inertial effects of superstructure and kinematic effects due to soil displacement. Also, simplified 1D, 2D [8][9][10][11][12][13] and 3D [14][15][16][17][18] numerical studies have been performed by several researchers using robust numerical codes and platforms due to spatial and economic limitations of physical model. 3D finite-element based dynamic study has been conducted by Oliaei et al [19] for large diameter pile under clay layer to examine soil and pile response during liquefaction.…”

Section: Introductionmentioning

confidence: 99%

Effects of axial loading on dynamic response of laterally loaded single piles in liquefiable layered soil of Kolkata city considering nonlinearity of soil

2022

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In the present study, an advanced nonlinear finite-element based 3D numerical study has been carried out to investigate the effects of axial loading on dynamic response of soil-pile system in liquefiable layered soil deposits of Kolkata city. An advanced soil constitutive law based on multi-yield surface plasticity model implemented in fully-coupled u-p formulation is adopted for soil-fluid interaction and pore water pressure development reasonably. The present model is validated with the past experimental results. Then, a detailed systematic parametric study is performed for numerical simulation of pile failures in layered soil deposit under axial loading by taking into account various soil conditions, pile and ground motion parameters. It is seen that the depth of liquefaction (DL) is decreased from 11.5 to 1.5 m adjacent to the pile when the axial load on pile increases from 0 to 1327 kN. Parametric studies also reveal that the bending moment response of pile under axial loading can be higher in non-liquefiable condition, with reference to the liquefiable condition. The peak lateral displacement decreases by 83.2% in non-liquefiable condition and 60.71% in liquefiable condition due to decrease of axial load from 1327 to 0 kN. Also, peak bending moment developed in the pile decreases by 97.2% in non-liquefiable condition and 82.7% in liquefiable condition when the axial load reduces from 1327 to 0 kN. So, the designer should be considered both extreme scenarios for safe and economical design. Also, it is noticed that the buckling capacity of pile is improved significantly by using larger diameter pile and the bending capacity is increased by selecting higher grade of concrete. It is concluded that the bending and buckling failure mode may be avoided by selecting a suitable combination of material strength and pile geometry.

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“…In addition to the referred experimental e orts, numerical studies have been carried out by various codes and platforms. Some notable instances of such studies include: Finn et al [11], Tabesh & Poulos [12], Miyazaki et al [13], Finn and Fujita [14], Klar et al [15], Liyanapathirana and Poulos [16,17], Chang et al [18], Bhattacharya et al [19], Elgamal et al [20], Cheng and Jeremic [21], Cubrinovski et al [22], Rahmani and Pak [23], Asgari and Oliaei [24], Sarkar et al [25], Bouckovalas and Chaloulos [26], Asadi and Shari pour [27], and Lin et al [28].…”

Section: Literature Reviewmentioning

confidence: 99%

Dynamic behavior of large-diameter piles with considering liquefaction under clay layer

Oliaei

Ghotbi

2017

Scientia Iranica

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Abstract. Marine structures are mostly constructed on deep foundations, namely largediameter piles. Such support structures are driven into deposits of saturated granular soil, vulnerable to liquefaction under loadings of dynamic nature, e.g. earthquakes. Although numerous studies have been accomplished to obtain a comprehensive understanding of their performance during liquefaction, a conclusive study has not been presented for the speci c case of large-diameter piles under a clay layer. This issue has great importance in the case of o shore wind turbines, since they are very sensitive to dynamic loadings. In this study, a 3D FEM model was constructed by OpenSeesPL to explore soil and pile responses throughout liquefaction. To capture the precise behavior, a constitutive law based on a multi-surface plasticity was utilized for soil. The described model used in this study is capable of accurate prediction of sand behavior in undrained conditions. Di erent scenarios were tested: variations in pile dimensions, loading frequency, and in uence of clay layer. Sensitivity analyses show that loading frequency, presence of clay layer, and pile diameter could signi cantly a ect the behavior of large-diameter piles in saturated soil conditions.

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A Numerical Model for Seismic Analysis of Piles in Liquefying Soil

Cited by 4 publications

References 2 publications

Dynamic Soil–Structure Interaction Effects in Buildings Founded on Vertical Reinforcement Elements

Dynamic Soil–Structure Interaction Effects in Buildings Founded on Vertical Reinforcement Elements

Effects of axial loading on dynamic response of laterally loaded single piles in liquefiable layered soil of Kolkata city considering nonlinearity of soil

Dynamic behavior of large-diameter piles with considering liquefaction under clay layer

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